986157.fig.002a
(a)
986157.fig.002b
(b)
986157.fig.002c
(c)
986157.fig.002d
(d)
Figure 2: SEM images of the samples (a) without and (b) with solution pretreatment using Zn(OAc)2·2H2O as raw material and (c) without and (d) with solution pretreatment using Zn(NO3)2·6H2O as raw material. Inset: TEM images of the corresponding sample.